Vibrating mechanism



, April 5, 1932- M. P. REYNOLDS 1,852,677

VIBRATING MECHANISM Filed Nov. 19, 1929 INVENTORI. ha/ly mw/zmfigomfafs A TTO EYJ.

Patented Apr. 5, 1932 UNITED STATES PATENT OFFICE MORLEY PUNSHON REYNOLDS, OF CLEVELAND HEIGHTS, OHIO, ASSIGNOZR- TO THE 'W. TYLER COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO VIIBBATING MECHANISM Application filed November 19, 1929. Serial No. 408,226.

The present invention, relating as indicated to a vibrating mechanism, is more particularly directed to the provision of a new and improved reciprocable vibrating apparatus for various uses, and particularly or use in screening apparatus to effect movements of the screening surfaces. The principal object of the invention is the provision of a vibrating mechanism which will permit of the use of greater power than is possible with those now in use, and which will provide a longer stroke while preventing any rapid destructive action on the mechanical parts of the apparatus. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means here-- inafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of varii an electromagnetic ous mechanical forms in which the principle of the invention may be used.

In said annexed drawing:

The single figure there appearing is a central vertical section through my improved apparatus showing the same connected to a woven wire screen for operating the same.

The most effective screening apparatus now in general use consists of a woven wire screen mounted in a frame tensioned between two opposite edges and operated by means of vibrating apparatus mounted at right angles to the screen surface and having the armature of the electromagnet secured either tothe screen surface or to a vibrating strip in turn secured thereto. The vibrating apparatus, as now in use, is extremely effective for screen cloth of fine mesh, but is not capable of eifectively operating coarse screen cloth and has the disadvantage of rapid destructive action on certain parts of the apparatus. Of course, as the coarseness of the screen cloth increases, the unit weight of such cloth likewise increases, and similarly as the coarseness of the material to be screened increases, the total before the present invention depended for its effective action, to a considerable extent, upon bringing the vibrating mechanism to a arring stop at one end of its stroke.

The formerly-known mechanism is, as has been stated, very effectively and quite satisfactory so long as it is used with fine screen cloth and with relatively light material loads, but, as will be obvious, as the weight of the screen and the weight of the material load on the screen is increased, the power required to operate the screen likewise increases very greatly. Furthermore, as it is attempted to construct screening devices to handle coarser and coarser material, it is found that vibrations of greater and greater amplitudes are required to effect a satisfactorily close grading of the material.

As the power required to operate the device is increased, and as the amplitude of the stroke of the vibrator is increased, it is found that the mechanism for effecting the jarring stop above mentioned is subjected to more and more severe blows; and experiments have shown that if machines of the old type are built of a size and character properly to handle material of one-inch diameter and larger, the stop members of the organization are so severely abused that they will not stand up for a reasonable length of time.

It is to remedy this condition that the im proved apparatus now to be described has been designed, such apparatus being particularly adapted for operating coarse woven wire screen cloth for grading material of oneineh diameter and larger, although it is not, of course, in any way limited to this particular application, being well adapted for use with finer material and cloth. The figure is a central transverse section with parts in elevation.

Referring to the drawing, I have shown a box-like frame 1 between the opposite sides of which is secured a woven wire screen 2 1 though other means of securing the screen in the frame may, of course, be employed. Extending along the screen parallel to the tensioned edges are metallic strips 5 and 6 which are bolted to the screen cloth, and on which is mounted a U-shaped bracket 7 to which the armature of the electro-magnetic apparatus may be secured.

The electro-magnetic vibrating apparatus consists of a frame 10 suitably mounted upon the casing 1 in which the screen is'housed, and provided with a box-like portion 11 in which themagnets and armature are housed. The fields 12 of the electro-magnet are mount ed centrally in this box-like extension 11, and operate upon an armature 13 having a double extension 14 which straddles the magnet, and an extension 15 which extends downwapdly for connection with the screen bracket The bottom plate 16 of the housing 11 is substantially centrally provided with an upstanding annular hub 17, and a spring 18 has its one end received about said hub 17 and its other end bearing against the lower surface of the armature 13, the spring 18 being of such strength as substantially to balance the weight of the screen 2 and its normal load of material. At its upper end, the double extension 14 carries a cross-head 19 against which bears one end of a spring 20, the opposite end of which is received in contact with a flanged member 21 adjustably mounted in the housing 11 through the medium of a spindle 22 threaded in said housing and rotatable with respect to said member 21, said spindle 22 carrying a hand wheel 23 externally of said housing. As will be obvious, the spring 20 is adapted to maintain the armature 13 in a position of equilibrium, moving such armature away from the magnet at such times as the current in the magnet field is zero. The adjustment of the spring 20 may be varied to compensate for differences in material loads.

Adjacent each side of the armature 13 and in the housing 11 there are provided a pair of upstandingrods 24, gtending from the top to the bottom of the housing 11,'such rods being parallel to the direction of motion of the armature 13 under the influence of the magnet. Adjacent its'base, each of said rods extends through a block 25 upon which may be mounted any desired number of shims 26. A flanged collar 27 is sleeved on each of said rods, its elevation being determined by the shims 26, and a clamp 28 secures said collar and said shims to said block 25. A coiled spring 29 is sleeved on each of said rods and has its lower end centered and supported upon said collar 27. A second flanged collar 30 is sleeved on each of said rods 24 and is supported in spaced relation to said collar 27 by the upper end of said spring 29, as shown. buffer plate 31 is provided w th an. aperture in each end, and said plate is slidably mounted on one pair of said rods 24, being supported by said springs 29 and collars 30. Of course it is to be understood that the buffer plate 31 is duplicated at the right-hand end of the housing 11.

Upon each of said rods 24 there is mounted a collar 32, slidable upon said rod and supported on the buffer plate 31, each of said collars forming a centering support for the lower end of a coiled spring 33. The upper end of each of said springs is centered on, and supports, a collar 34 sleeved on said rod 24; and each of said collars 34 is backed up and prevented from moving upwardly by a block 35 receiving the rod 24 and formed on the top plate of the housing 11. Shims 36 are insertablebetween the blocks 35 and the collars 34 to vary the compression of the springs 33.

Each end of the armature 13 extends outwardly beyond and between the rods 24, so that the buffer plates 31 are disposed in the paths of said armature ends. When the parts are in a position of rest, the armature 13 is positioned at a level below that at which the buffer plates 31 are supported by the springs 29. If the magnet is now energized, the armature 13 will be moved suddenly upward, and its ends will strike smartly against the buffer plates 31. A definite jar will thus be given" to the screen 2, but this ,jar will be cushioned by the resiliency of the springs 33, which give slightly to theimpact. The springs 33 are preferably soadjusted as to stop the armature just before the striking plates 37 on said armature come into contact with the wear plates 38 on the housing. Upon a reversal of the current in the field 12 of the magnet, the armature 13 moves downwardly, and the buffer plates 31 move with said armature until'their further movement is obstructed by the compression of lower springs 29.

The striking plates 37 and wear plates 38 are provided to guard against the possibility of blows being delivered against the soft laminated iron of the electro-magnetic elements. As shown, the wear plates 38 may be adjustably positioned in the housing 11 through the medium of shims 39.

While it is not essential so to mount the armature 13, I have found that one very satisfactory embodiment of my invention comprises the use of a resilient armature guide strip 40 secured to the lower surface of said armature 13, and extending transversely of the housing 11 substantially from end to end thereof. The edges of said plate 40 are preferably supported in the folloi v ing manner. A U-bolt 41 is mounted at each end of the housing 11 and embraces a me tallic casing 42 which encloses a rubber or other resilient block 43, the edges of said casing abutting the inner surface of the upper wall of the housing 11. The bolts 41 are secured in place by nuts 44 and the blocks 43 are provided with slots opening through their inner edges, and said slots receive the edges of the strip 40. This mounting, of course, provides for limited movement of the ends of the strip in the direction of the length of said strip, while providing a resilient mounting for said ends.

As will be seen from the above description, the device of the present application is capable of much more efficient operation for screening the coarsersizes of materials than is any other device of this character. The possible amplitude of stroke to which the present device can be adapted is much higher than that of other devices ofsimilar character, since the floating mounting of the armature prevents undue shock in the organization. Due to the possibility of using a longer stroke than has been possible with other forms of apparatus, it is possible to operate the screen of the present application at a lower angle than is usual; closer grading can be obtained; coarser separations can be handled because of the possibility of using increased power; and the destructive ture toward said magnet? action of the elements of 'the mechanism upon each other is materially decreased.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularlypoint out and distinctly claim as my invention 1-. In an electro-magnetic vibrator, a magnet, an armature mounted for reciprocation toward and away from said magnet, resilient means supporting said armature and resilient means pressing downwardly on said armature, both of said means tending to maintain said armature spaced a predetermined distance from said magnet, and separate resilient means to arrest movement of said arma- 2. In an electro-magnetic vibrator, a magnet, an armature mounted below said magnet for reciprocation toward and away from said magnet, resilient means supporting said ar- -mature, resilient means pressing downwardly on said armature and other resilient means for arresting upward movement of said armature.

3. In an electro-magnetic vibrator, a magnet, an armature mounted for reciprocation toward and away from said magnet, and resilient stop means engageable by said armature during movement of the latter toward said magnet.

4. In an electro-magnetic vibrator, a magnet, an armature mounted for reciprocation toward and away from said magnet, balanced means pressing upwardly and downwardly on said armature, an element disposed in the path of said armature, and a spring engaging said element and resiliently limiting the degree of movement of said element in one direction.

5. In an electro-lnagnetic vibrator, a magnet, an armature mounted for reciprocation toward and away from said magnet, an element disposed in the path of said armature, and engageable thereby as said armature moves toward said magnet,-and a spring engaging said element and resiliently limiting the degree of movement of said element under the influence of said armature.

6. In a device of the class described, a magnet, an armature mounted for reciprocation toward and away from said magnet, an element disposed in the path of said armature, means limiting the movement of said element in one direction, and resilient means limiting the movement of said element in the opposite direction.

7. In a device of the class described, a magnet, an armature mounted for reciprocation toward and away from said magnet, an element disposed in the path of said armature, means preventing said element from moving to the limit of the stroke of said'armature away from said magnet, and means for limiting the movement of said element toward said magnet.

8. In a device of the class described, a magnet, an armature mounted for reciprocation toward and away from said magnet, means interposed between said magnet and said armature and adapted to be struck by said armature as the latter moves toward said magnet, and resilient means for limiting the movement of said interposed means under the influence of said armature.

9. In a device of the class described, a magnet, an armature mounted for reciprocation toward and away from said magnet, a bufler plate reciprocably mounted in the path of said armature, means for limiting the following movement of said buffer plate as said armature moves away from said magnet, and resilient means for limiting the movement of said plate toward said magnet.

10. In a device of the class described, a magnet, an armature mounted for reciprocation toward and away from said magnet, a butter plate reciprocably mounted in the path of said armature, resilient means for preventing said plate from following said armature to the end of its stroke away from said magnet, and resilient means for limiting the movement of said plate toward said magnet.

11. In a device of the class described; a magnet, an armature mounted for reciprocation toward and away from said magnet, a buffer plate reciprocably mounted in-the path of said armature, resilient means for preventing said plate from following said armature to the end of its stroke away from said magnet upon failure of said first-menthe movement of said plate and of said armature toward said magnet.

12. In a screen vibrating mechanism, a housing, a magnet in said housing, an armature reciprocably mounted in said housing for reciprocation toward and away from said magnet, resilient means urging said armature away from said magnet, and other resilient means limiting the movement of said armature toward said magnet.

13. In a device of the class described, a housing, a magnet in said housing, an armature in said housing, a rod in said housing and extending parallel to the direction of movement of said armature toward and away from said magnet, means slidable on said rod and disposed in the path of said armature, means supporting said first-named means in a position closer to said magnet than the extremity of the stroke of said armature, and resilient means limiting the movement of said first-named means toward said magnet.

14. In a device of the class described, a magnet, an armature disposed below said magnet and movable toward and away from said magnet, a rod extending substantially parallel to the direction of movement of said armature, means slidably mounted on said rod and disposed in the path of said armature, means supporting said first-named means above the lower extremity of the stroke of said armature, and resilient means for limiting the upward movement of said first-named means.

15. In a device of the class described, a magnet, an armature disposed below said magnet and movable toward and away from said magnet, a rod extending substantially parallel to the direction of movement of said armature, means slidably mounted-on said rod and disposed in the path of said armature, means resiliently supporting said first-named means above the lower extremity of the stroke of said armature, and resilient means for limiting the upward movement of said firstnamed means.

16. In a device of the class described, a magnet, an armature disposed below said magnet and movable toward and away from said magnet, a rod extending substantially parallel'to the direction of movement of said armature, means slidably mounted on said rod and disposed in the path of said armature, and means resiliently securing said first-named means against movement to the level of the lower extremity of the stroke of said armature and against movement to the level of the lower end of said magnet.

17. In a device of the class described, a magnet, an armature, means resiliently limiting the movement of said armature toward said magnet, and normally inoperative means for preventing contact of said armature with said magnet, and resilient means for limiting tioned means.

Signed by me this 9th day of November, 1929.

MORLEY PUNSHON REYNOLDS. 

